diff --git a/src/mad/ruby/ActionManager.rb b/src/mad/ruby/ActionManager.rb
index 622734061a..19b9e7981a 100644
--- a/src/mad/ruby/ActionManager.rb
+++ b/src/mad/ruby/ActionManager.rb
@@ -151,7 +151,7 @@ class ActionManager
                 @threads_cond.signal
             else
                 i = @action_queue.select{|x| x[:id] == action_id}.first
-                @action_queue.delete_at(i) if i
+                @action_queue.delete(i) if i
             end
         }
     end
diff --git a/src/mad/ruby/OpenNebulaDriver.rb b/src/mad/ruby/OpenNebulaDriver.rb
index b45c069d55..675348055c 100644
--- a/src/mad/ruby/OpenNebulaDriver.rb
+++ b/src/mad/ruby/OpenNebulaDriver.rb
@@ -71,7 +71,7 @@ class OpenNebulaDriver < ActionManager
     def start_driver
         loop_thread = Thread.new { loop }
         start_listener
-        loop_thread.kill!
+        loop_thread.kill
     end
 
 private